Research on Prestrike Characteristics of Double-Break VCB Under Direct Current Voltages

doi:10.16628/j.cnki.2095-8188.2021.10.002

Abstract

Abstract:

The purpose of this paper is to study the prestrike characteristics of a double-break vacuum circuit breaker under direct current voltages.In this experiment,we measured the prestrike gap of the single-break and the double-break vacuum circuit breaker in closing operations under different voltage levels,and calculated their Weibull probability distribution.The results show that,compared with the 50% prestrike gap of the single-break vacuum circuit breaker,the d₅₀ of each vacuum interrupter in the double-break vacuum circuit breaker is reduced by 25.0%~72.7%.Due to the voltage sharing effect of double-break vacuum breaker,the dispersion of the prestrike gaps of the vacuum interrupters in the high voltage side and low voltage-side of double-break vacuum breaker is significantly lower than that of the single-break vacuum circuit breaker.

Key words: vacuum circuit breaker(VCB), double-break, prestrike characteristics, vacuum interrupter, prestrike gap

CLC Number:

TM561

PENG Jing, DENG Yunkun, WANG Ke, CHEN Xinggui, GENG Yun, GENG Yingsan. Research on Prestrike Characteristics of Double-Break VCB Under Direct Current Voltages[J]. LOW VOLTAGE APPARATUS, 2021, 0(10): 7-12.

Figures/Tables 11

References 17

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实验分组	直流电压/kV	试验设置	实验次数/次
实验1	U_s	单断口VI_A	30
实验2	U_s	单断口VI_B	30
实验3	U_s	双断口	30

实验分组		U_s/kV	β	η/mm	R_-Square
实验1 (VI_A)		10	2.2	0.30	0.99
		20	4.9	0.50	0.98
		30	6.7	0.70	0.99
		40	10.3	1.00	0.95
实验2 (VI_B)		10	1.8	0.10	0.99
		20	3.2	0.30	0.99
		30	3.7	0.70	0.97
		40	3.4	1.10	0.99
VI_A VI_B		10	0.9	0.20	0.97
		20	2.6	0.60	0.99
		30	5.3	0.90	0.99
		40	4.6	1.10	0.97
实验 3	VI_A	10	1.2	0.20	0.95
		20	3.3	0.40	0.99
		30	5.9	0.50	0.99
		40	4.7	0.70	0.96
	VI_B	10	0.8	0.04	0.99
		20	1.9	0.20	0.99
		30	4.7	0.30	0.99
		40	4.7	0.40	0.97

实验分组		U_s/kV	d₁₀/mm	d₅₀/mm	d₉₀/mm	σ/mm
实验1 (VI_A)		10	0.4	0.2	0.1	0.1
		20	0.6	0.5	0.3	0.2
		30	0.8	0.7	0.5	0.1
		40	1.1	1.0	0.8	0.2
实验2 (VI_B)		10	0.2	0.1	0.0	0.1
		20	0.4	0.2	0.1	0.2
		30	0.8	0.6	0.4	0.2
		40	1.4	1.0	0.6	0.4
实验 3	VI_A VI_B	10	0.5	0.1	0.0	0.2
		20	0.8	0.5	0.3	0.2
		30	1.0	0.8	0.6	0.2
		40	1.4	1.0	0.7	0.3
	VI_A	10	0.3	0.1	0.0	0.1
		20	0.5	0.4	0.2	0.1
		30	0.6	0.5	0.4	0.1
		40	0.8	0.6	0.4	0.2
	VI_B	10	0.1	0.0	0.0	0.1
		20	0.3	0.2	0.1	0.1
		30	0.4	0.3	0.2	0.1
		40	0.5	0.4	0.3	0.1

实验条件		U_s/kV
实验条件		10	20	30	40
VI_A	δ (d₁₀)	-17.9	-19.4	-24.4	-24.8
	δ (d₅₀)	-47.8	-27.1	-27.5	-35.1
	δ (d₉₀)	-70.0	-42.4	-28.8	-48.1
VI_B	δ (d₁₀)	-40.0	-5.7	-51.2	-62.3
	δ (d₅₀)	-72.7	-25.0	-48.3	-58.3
	δ (d₉₀)	-100.0	-46.2	-41.7	-50.9